[NT]Vulnerability in Windows Media Player Allows Code Execution (MS08-054)



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Vulnerability in Windows Media Player Allows Code Execution (MS08-054)
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SUMMARY

This security update resolves a privately reported vulnerability in
Windows Media Player that could allow remote code execution when a
specially crafted audio file is streamed from a Windows Media server. If a
user is logged on with administrative user rights, an attacker who
successfully exploited this vulnerability could take complete control of
an affected system. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights. Users whose
accounts are configured to have fewer user rights on the system could be
less impacted than users who operate with administrative user rights.

This security update is rated Critical for all supported and affected
editions of Windows Media Player 11. For more information, see the
subsection, Affected and Non-Affected Software, in this section.

DETAILS

Affected Software:
* Windows XP Service Pack 2 and Windows XP Service Pack 3 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=d5891180-5dd1-49ec-bcc6-3030a544202c> Windows Media Player 11 - Remote Code Execution - Critical - None
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=caf8a45e-a9f8-4e91-98fd-87eddbeae64c> Windows Media Player 11 - Remote Code Execution - Critical - None
* Windows Vista and Windows Vista Service Pack 1 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=2f4118fd-1ffb-46da-b922-cd4ca4f9d84e> Windows Media Player 11 - Remote Code Execution - Critical - None
* Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1
-
<http://www.microsoft.com/downloads/details.aspx?FamilyId=334352e7-d41f-494f-866d-f1f1745ffd17> Windows Media Player 11 - Remote Code Execution - Critical - None
* Windows Server 2008 for 32-bit Systems* -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=72fc6028-6af4-44ec-8d2a-28c53807d6bc> Windows Media Player 11 - Remote Code Execution - Critical - None
* Windows Server 2008 for x64-based Systems* -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=3906512b-26db-473e-b522-3883ff34a21c> Windows Media Player 11 - Remote Code Execution - Critical - None

*Windows Server 2008 server core installation not affected. The
vulnerability addressed by this update does not affect supported editions
of Windows Server 2008 if Windows Server 2008 was installed using the
Server Core installation option, even though the files affected by this
vulnerability may be present on the system. However, users with the
affected files will still be offered this update because the update files
are newer (with higher version numbers) than the files that are currently
on your system. For more information on this installation option, see
Server Core. Note that the Server Core installation option does not apply
to certain editions of Windows Server 2008; see Compare Server Core
Installation Options.

Non-Affected Software:
* Windows 2000 Service Pack 4 - Windows Media Player 6.4
* Windows 2000 Service Pack 4 - Windows Media Player 7.1
* Windows 2000 Service Pack 4 - Windows Media Player 9
* Windows XP Service Pack 2 and Windows XP Service Pack 3 - Windows Media
Player 6.4
* Windows XP Service Pack 2 and Windows XP Service Pack 3 - Windows Media
Player 9
* Windows XP Service Pack 2 and Windows XP Service Pack 3 - Windows Media
Player 10
* Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1
- Windows Media Player 10
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 - Windows Media Player 6.4
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 - Windows Media Player 10
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 - Windows Media Player 10
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows
Server 2003 with SP2 for Itanium-based Systems - N/A
* Windows Server 2008 for Itanium-based Systems - N/A

Windows Media Player Sampling Rate Vulnerability - CVE-2008-2253:
A remote code execution vulnerability exists in Windows Media Player 11.
An attacker could exploit the vulnerability by constructing a specially
crafted audio file that could allow remote code execution when streamed
from a Windows Media server using Windows Media Player 11. An attacker who
successfully exploited this vulnerability could take complete control of
an affected system.

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2253>
CVE-2008-2253

Mitigating Factors for Windows Media Player Sampling Rate Vulnerability -
CVE-2008-2253
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:

* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. Users whose accounts are
configured to have fewer user rights on the system could be less impacted
than users who operate with administrative user rights.

Workarounds for Windows Media Player Sampling Rate Vulnerability -
CVE-2008-2253
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality:

* Unregister wmpeffects.dll
To unregister this DLL, run the following command from an elevated command
prompt:

For 32-bit Windows-based systems:
Regsvr32.exe u %WINDIR%\system32\wmpeffects.dll

For 64-bit Windows-based systems:
Regsvr32.exe u %WINDIR%\syswow64\wmpeffects.dll

Impact of workaround: Visualizations will fail to display in the Now
Playing view of Windows Media Player.

How to undo the workaround: Run the following command from an elevated
command prompt:

For 32-bit Windows-based systems:
Regsvr32.exe %WINDIR%\system32\wmpeffects.dll

For 64-bit Windows-based systems:
Regsvr32.exe %WINDIR%\syswow64\wmpeffects.dll

FAQ for Windows Media Player Sampling Rate Vulnerability - CVE-2008-2253
What is the scope of the vulnerability?
This is a remote code execution vulnerability. If a user is logged on with
administrative user rights, an attacker who successfully exploited this
vulnerability could take complete control of an affected system. An
attacker could then install programs; view, change, or delete data; or
create new accounts with full user rights. Users whose accounts are
configured to have fewer user rights on the system could be less impacted
than users who operate with administrative user rights.

What causes the vulnerability?
Windows Media Player 11 incorrectly handles specially crafted audio-only
files streamed from a Windows Media Server in a server-side playlist
(SSPL).

What is a server-side playlist (SSPL)?
A SSPL is a list that identifies what content is played for a client, the
time at which it is played, and the order in which it is played. The SSPL
for a Windows Media server is an XML document. For more information about
SSPL, see Server-Side Playlists.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run
arbitrary code. An attacker could then install programs; view, change, or
delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted audio
file from a Windows Media Server.

In a Web-based attack scenario, an attacker would have to host a Windows
Media Server that contains a specially crafted audio file that is used to
attempt to exploit this vulnerability. An attacker would have no way to
force users to visit a specially crafted Web site. Instead, an attacker
would have to convince them to visit the Web site, typically by getting
them to click a link in an e-mail message or Instant Messenger message
that takes them to the attacker's site.

What systems are primarily at risk from the vulnerability?
Any system using Windows Media Player, such as workstations or terminal
servers, is at risk from this vulnerability.

What does the update do?
The update addresses the vulnerability by correcting the manner in which
Windows Media Player 11 handles audio files streamed from a SSPL.

When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure. Microsoft had not received any information to
indicate that this vulnerability had been publicly disclosed when this
security bulletin was originally issued.

When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers and had not seen
any examples of proof of concept code published when this security
bulletin was originally issued.


ADDITIONAL INFORMATION

The information has been provided by Microsoft Product Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/Bulletin/ms08-054.mspx>
http://www.microsoft.com/technet/security/Bulletin/ms08-054.mspx



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